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The game will be launching on Steam Early Access, meaning that for $20 you'll get a playable but not quite finished version of the game. What that means in greater detail: The game will be crash-prone and will probably have some bugs, and more importantly for some, there aren't mouse and keyboard controls yet. You'll have to use an Xbox 360 controller, at least until they get the M&K controls perfected. (The game is currently only available on Xbox Live Arcade, so the original version was designed for a controller.)

In an update at the official game site, Undead Labs' Sanya Weathers explains what early access players can expect, and stresses that this won't be the final-final version of the game.

What you’ll see this Friday, if you choose to join forces with us to make the PC version kick ass, is a test version. It’s not ready to be reviewed. It will not be perfect. It may still have crashes. What it won’t have is a keyboard and mouse interface…not at first. Why not? Over the next however many weeks, we will be putting up versions of the keyboard interface and using your comments and feedback to make it awesome. Right this minute, the Early Access version requires an Xbox 360 controller.

This process is not for everyone. Casual players, the easily frustrated, and the short of time should NOT get the Early Access version. Hey, I am all three of those things, y’all. Those are not criticisms. It’s just that we want everyone to have the experience that best suits their needs. You all deserve the best, so if you’re not into giving feedback, just wait a few months and play the final version after we make it great.

Sounds good to me! I've been waiting for the PC version to play this game, so I'm in.